<template>
    <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
    <!-- 提示区域 -->
    <el-alert
    title="添加商品信息"
    type="info"
    center
    show-icon
    :closable="false">
  </el-alert>
  <!-- 步骤条区域 active只能接收数值 -->
  <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
  <el-step title="基本信息"></el-step>
  <el-step title="商品参数"></el-step>
  <el-step title="商品属性"></el-step>
  <el-step title="商品图片"></el-step>
  <el-step title="商品内容"></el-step>
  <el-step title="完成"></el-step>
</el-steps>
<!-- tab栏区域 -->
<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
<el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
    <el-tab-pane label="基本信息" name="0">
        <el-from-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
        </el-from-item>
         <el-from-item label="商品价格" prop="goods_price">
             <!-- 规定只能输入数字 -->
            <el-input v-model="addForm.goods_price" type="number"></el-input>
        </el-from-item>
         <el-from-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
        </el-from-item>
         <el-from-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
        </el-from-item>
        <!-- 级联选择器 -->
        <el-from-item label="商品分类" prop="goods_cat">
        <el-cascader
        v-model="addForm.goods_cat"
        :options="options"
        :props="cateProps"
        @change="handleChange">
        </el-cascader>
        </el-from-item>
    </el-tab-pane>
    <el-tab-pane label="商品参数" name="1">
        <!-- 渲染表单的item项 -->
        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
            <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
        </el-checkbox-group>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品属性" name="2">
        <el-form-item :label="attr_name" v-for="item in onlyTableData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
        </el-form-item>
    </el-tab-pane>
    <!-- 图片上传区域 action表示图片要上传到的后台api地址 -->
    <el-tab-pane label="商品图片" name="3">
        <el-upload
        :action="uploadURL"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        list-type="picture"
        :headers="headersObj"
        :on-success="handleSuccess">
        <el-button size="small" type="primary">点击上传</el-button>
        </el-upload>
    </el-tab-pane>
    <el-tab-pane label="商品内容" name="4">
        <!-- 富文本编辑器 -->
        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
        <!-- 添加商品的按钮 -->
        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
    </el-tab-pane>
  </el-tabs>
</el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" alt="" class="previewImg">
</el-dialog>
    </div>
</template>

<script>
// 导入lodash
import _ from 'lodash'
export default {
    data() {
        return {
            // 步骤条索引值
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片信息
                pics: [],
                // 商品详情
                goods_introduce: '',
                attrs: []
            },
            // 表单规则
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态列表数据
            onlyTableData: [],
            // 上传图片的地址
            uploadURL: '',
            // 图片上传组件的请求头
            headersObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 预览图片地址
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品列表数据
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200){
                return this.$message.error('获取列表失败！')
            }
            this.catelist = res.data
        },
        // 级联选择器选项中变化，会触发此函数
        handleChange() {
            console.log(this.addForm.goods_cat);
            // 如果没选中三级内容就直接清空数组
            if (this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        // 监听切换标签事件 阻止未选择分类就切换标签问题
        beforeTabLeave(activeName, oldActiveName) {
            if (oldActiveName === 0 && this.addForm.goods_cat !== 3){
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        async tabClicked() {
            // 证明访问的是商品参数面板
            if (this.activeIndex === '1'){
               const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
                if (res.meta.status !== 200) {
                return this.$message.error('获取动态参数列表失败！')
                }
                res.data.forEach(item => {
                    // forEach循环分割数组内容
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2'){
                // 获取静态属性
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
                if (res.meta.status !== 200) {
                return this.$message.error('获取静态属性列表失败！')
                }
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览
        handlePreview(file) {
            console.log(file);
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片
        handleRemove(file) {
            // 1、获取删除图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2、从pics数组中找到这个图片的对应索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3、调用数组的splice方法将图片从数组中移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm);
        },
        // 监听图片上传成功事件
        handleSuccess(response) {
            // 1、拼接得到图片
            // 2、将拼接好的图片push到pics数组中
            const picInfo = { pic: response.data.tmp_path }
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        // 添加商品
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的信息！')
                }
                // 执行必要的业务逻辑
                // 级联选择器和逻辑冲突
                // 进行深拷贝lodash  cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                this.addForm.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = { attr_id: '', attr_value: item.attr_vals.join(' ') }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                 this.onlyTableData.forEach(item => {
                    //  静态属性本来就是字符串
                    const newInfo = { attr_id: '', attr_value: item.attr_vals }
                    this.addForm.attrs.push(newInfo)
                })
                // 将两种参数推送到attrs
                form.attrs = this.addForm.attrs
                console.log(form);
                // 发起请求添加商品
                const { data: res } = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                // 添加成功后跳转到商品列表页面
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            // 如果选中三级内容就返回id
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
// 图片预览
.previewImg{
    width: 100%;
}
.btnAdd{
    margin: 10px;
}
</style>
